Optical disc driving device having shaft upwardly protruding from chucking mechanism

Abstract

There is provided an optical disc driving device including: a sleeve holder fixed to a base member; a sleeve fixed to the sleeve holder; a shaft rotating while being inserted into the sleeve; a rotor hub fixed to the shaft and rotating together with the shaft; a chucking mechanism fixed to the rotor hub and having a disc mounted thereon; and an upper case forming an internal space, together with the base member, wherein the shaft is protruded upwardly from the chucking mechanism.

What is claimed is: 
     
       1. An optical disc driving device, comprising:
 a sleeve holder fixed to a base member; 
 a sleeve fixed to the sleeve holder; 
 a shaft rotating while being inserted into the sleeve; 
 a rotor hub fixed to the shaft and rotating together with the shaft; 
 a chucking mechanism fixed to the rotor hub and having a disc mounted thereon; 
 an upper case forming an internal space, together with the base member; and 
 a spring member mounted on an inside of the upper case to be disposed above the shaft, 
 wherein the shaft is protruded upwardly from the chucking mechanism. 
 
     
     
       2. The optical disc driving device of  claim 1 , wherein the spring member is configured as one of a coil spring and a leaf spring. 
     
     
       3. The optical disc driving device of  claim 1 , wherein the shaft and the spring member are disposed to have a predetermined distance therebetween. 
     
     
       4. The optical disc driving device of  claim 1 , further comprising a stopper member mounted on the base member to prevent the shaft from overfloating,
 wherein a bottom portion of the shaft is provided with an insertion groove into which the stopper member is inserted. 
 
     
     
       5. The optical disc driving device of  claim 1 , wherein the shaft is formed of a material having a higher strength than that of the upper case to prevent the shaft from being deformed when the shaft contacts the upper case due to an external impact. 
     
     
       6. The optical disc driving device of  claim 1 , further comprising:
 a stator core mounted on an outer circumferential surface of the sleeve holder; and 
 a pulling magnet mounted on the stator core facing the rotor hub. 
 
     
     
       7. An optical disc driving device, comprising:
 a sleeve holder fixed to a base member; 
 a sleeve fixed to the sleeve holder; 
 a shaft rotating while being inserted into the sleeve; 
 a rotor hub fixed to the shaft and rotating together with the shaft; 
 a chucking mechanism fixed to the rotor hub and having a disc mounted thereon; 
 an upper case forming an internal space, together with the base member; and 
 a plate-shaped damper member mounted on an inside of the upper case to be disposed above the shaft and formed of an elastic material, 
 wherein the shaft is protruded upwardly from the chucking mechanism. 
 
     
     
       8. An optical disc driving device, comprising:
 a sleeve holder fixed to a base member; 
 a sleeve fixed to the sleeve holder; 
 a shaft rotating while being inserted into the sleeve; 
 a rotor hub fixed to the shaft and rotating together with the shaft; 
 a chucking mechanism fixed to the rotor hub and having a disc mounted thereon; 
 a stator core mounted on an outer circumferential surface of the sleeve holder to be disposed below the rotor hub; 
 a pulling magnet mounted on the stator core to face the rotor hub; 
 a stopper member mounted on the base member to prevent the shaft from overfloating; and 
 an upper case forming an internal space, together with the base member, 
 wherein the shaft is protruded upwardly from the chucking mechanism, 
 a bottom portion of the shaft is provided with an insertion groove into which the stopper member is inserted, and 
 the upper case has one of a spring member or a damper member on a lower surface thereof, such that the spring member or the damper member is disposed to face the shaft.